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The RWD base model comes equipped with non-staggered 205/55R16 tires all around. The car is mechanically and electronically identical to models equipped with the staggered setup.
I run non-staggered 245/40R17 all around during the summer as well. I've never had an issue.
I'll be running 245/45/17 all around this winter. Tires came with the rims and the guy that had them before me on an is350 never had any issues. When it's time to replace, I think I'll go with 205/50's.